Title:
ENCRYPTION KEY GENERATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/077697
Kind Code:
A1
Abstract:
A scramble key generation unit (26) subjects a predetermined initial encryption key to a unidirectional reverse replacement h1-1 at least once and a trapdoor-equipped unidirectional replacement h2 at least once, thereby generating a plurality of different scramble keys (individual encryption keys) used for encryption and decryption of distributed data. A time key generation unit (28) subjects one of the scramble keys generated by the scramble key generation unit (26) to the unidirectional reverse replacement h1-1 at least once, thereby generating a time key (master encryption key) used for regeneration of a scramble key. Thus, it is possible to effectively and flexibly generate a plurality of individual keys used for encryption and decryption of distributed data and a master encryption key capable of regenerating only some of the individual encryption keys.
Inventors:
KAJI YUICHI
Application Number:
PCT/JP2005/022617
Publication Date:
July 27, 2006
Filing Date:
December 09, 2005
Export Citation:
Assignee:
NAT UNIV CORP NARA INST (JP)
KAJI YUICHI
KAJI YUICHI
International Classes:
H04L9/08; H04L9/14
Foreign References:
| JPH0772793A | 1995-03-17 |
Other References:
NOJIMA R. ET AL.: "Otoshido Tsuki Ichihokosei Kansu o Riyo shita Kikozo Kagi Kanri Hoshiki", SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY YOKOSHU, vol. 1 OF 2, 26 January 2003 (2003-01-26), pages 131 - 136, XP003000586
KAJI Y. ET AL.: "Jikan Gentei Service o Jitsugen suru Tameno Jikeiretsu Kagi Kanri Hoshiki", SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY YOKOSHU, vol. 1 OF 4, 25 January 2005 (2005-01-25), pages 289 - 294, XP003000587
KAJI Y. ET AL.: "Jikan Gentei Service o Jitsugen suru Tameno Jikeiretsu Kagi Kanri Hoshiki", SYMPOSIUM ON CRYPTOGRAPHY AND INFORMATION SECURITY YOKOSHU, vol. 1 OF 4, 25 January 2005 (2005-01-25), pages 289 - 294, XP003000587
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (2-6, Tenjinbashi 2-chome Kita,, Kita-ku, Osaka-sh, Osaka, JP)
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